The rural church of Kolga-Jaani was evidently built during the last quarter of the 14th century, under the direction of a master craftsman from Tallinn. It was damaged in the Great Northern War and left in ruins for a long period. The 45-meter high steeple was erected in the reconstruction in 1875. The most significant artefact inside the church is a cruficix made probably around the yer 1380.
Between 1890-1917, the man of culture and the great figure of the national awakening period, Villem Reiman (1861-1917), was the pastor of the Kolga-Jaani church and a monument was established in his honour in 1988. On August 16, 1925, a memorial monument was set up to the 17 who had perished during the Liberation War. The statue was destroyed on June 19, 1941 and restored by May 28, 1989.
The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.